Engine cylinder



J. M. H. JACOB ENGINE (JYLINDER Filed Dec.

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o other words the width of Patented Aug. 7, 1928.

UNITED VSTATES JAMES M. H. JACOBS, OF DAYTON,

OHIO, ASSIG-NOR TO GENERAL MOTORS RESEARCH CORPORATION, OF DAYTON, OHIO, A CORPORATION OF ENGINE CYLINDER.

Application led December 13, 1922. Serial No. 606,760.

This invention relates to dissipat-ing heat from bodies of relatively low heat conductivity by means of conductive members of relatively high heat conductivity. This in 6 vention is particularly useful in connectlon with cast iron engine cylinders. It 1s an object of the invention to provide improved means for securing fins o copper or other material of high heat conductivity to a cyl- M) inder wall in such a manner as to secure them permanently thereto and permit heat to pass readily from the cylinder wall into the heat conducting fins'.

Further objects and advantages of the t present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of embodiment of the present invention is clearly shown. In the drawings: Fig. 1 is a side view partly in longitudinal section and partly in side elevation showing an engine cylinder constructed in accord-l ance with the present invention; l

Fig. 2 is a transverse section of the engine cylinder; and v Fig. 3 is an end view of the finning structure before bending around the cylinder.

Referring to the drawings, the finning an material or structure is formed of copper or high heat conductivity by other metal of casting, rolling, or extruding the copper into the form shown in Fi 3. This form of the material includes a ase portion 20 from which extends a lurality of relatively thin fins 21 and suita le spacing lugs 22. The formed material may be made in long strips of a width suitable for a required length of fin when secured to the engine cylinder. In this stri may be equal to the length L in Fig. 1. The length o this strip of metal ficientjzo extend around the outer surface of the cast iron cylinder. Such a strip of material will present in section a comb-like contour of which the teeth are the fins and of which the back is comparatively thin and flexible.

The engine cylinder 24 is rovided near its 5o lowerend with an annular ange or boss 25, the heightof which is equal to the height of the lugs 22 upon the finning material base,

so that when the base of thein metal is bent around the cylinder wall it will contact with Il the ring or ange 25 of the cylinder and will of course be suf face with cross ri s the spacing lugs 22 will contact directly with the cylinder wall leaving an annular space between base 20 and the cylinder wall 24.

' In securing the fins to the cylinder, the iinning material is placed about the cylinder in the manner just indicated and clamped in position in any suitable fashion and while the finning material is held in this position the annular space between the base portion 20 and the outer surface of the cylindrical wall 24 of the cylinder is filled with solder or brazing material havin a` relatively high melting point, suitable uxes being used. The flange 25 provides a sealing ring preventing the escape of the brazing material from Ithe bottom of the space between the fin and the cylinder.

In carrying out the pouring operation, the assembled cylinder and fin material should be preheated `in any suitable fashion and maintained in a heated condition durin the pouring, in order that the solder or rass may not'solidify too quickly to allow it to bond with the metals on either side of the annular space. Ordinarysolder of tin and`50% lead may be used but brazing metal is preferred. A suitable brazing metal for this purpose is brass having about copper and 40% zinc. Suchmaterial may absorb some of the copper of the fin metal but will provide a molecular bond between the iron of the cylinder and the fins. One advantage of the present invention is that the brazing material need not be heated to a relatively hightemperature to effect the brazing of the copper to the iron.

While the form of embodiment of the invention as herein shown and describedcon stitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What I claim is as follows:

1. A finning structure adapted to be secured upon cylinders of internal combustion 100 engines, comprising a strip of metal provided upon one face with a pluralityof transverse spacin lugs, and on the other extending parallel with said lugs, each rib being of considerably 105 greater height than thickness, the strip be ing suiiiciently thin between ribs to be flexible. v

2; A finnin structure adapted to be se cured upon cy ders of internal combustion l" engines, comprising a. strip of metal provided on-one ace with a. plurality of spacing lugs and provided on its other face with cross ribs of considerably greater height thany thickness, the strip-being suiciently thin between ribs to be flexiblen 3. A nning structure adapted to be secured upon the cylinder of an internal combustion engine comprising a series of plate like portions of metal extending longitudinally of and throughout the art of the cylinder to be' cooled, and whic portions are arranged alongside one another, and are parallel, one edge of each plate like portion eing integral with a base portion extending throughout the entire area of the part of the cylinder to be cooled, and which base port1on is common to all of said plate likeportions, and is flexible, said base portion having spacing lugs integral therewith und extending from the face thereof opposite said plate-like portions. v

In testimony whereof I hereto ailix my signature.

JAMES M. H. JACOBS. 

